Congress has gotten their balls back and also are now doing the job they were elected to do. I think Obama is going to flake out if he ends up being successfully sued and censured.
No, they haven't and no, this won't work.
I agree with Dr. Levin: if the Congress won't exercise its own Constitutional authority over the President, why should some court be dragged in as a patsy to do the jobs that Republicans won't do?
Thus any self-respecting court will say: whether I agree with you on the merits of you case is irrelevant. It's not the place of the court to intervene in a political dispute.
There are 2 Constitutional avenues available: impeachment and government shutdown via cutting off money. Suing the President isn't one of them.